Perhaps relevant...I installed an attenuator potentiometer in my Akitika GT102 amp in order to lower its gain to match my Dyna ST70 (w/VTA driver PCB upgrade) to enable hybrid bi-amping (SS on woof, VT on Mid-tweets). The pot was supplied by the designer of the amp to allow a single source input to be run w/o preamp.
See: https://akitika.com/documents/VC102AssemblyManualRev2p00.pdf
See: https://akitika.com/documents/VC102AssemblyManualRev2p00.pdf